Vacuum fluctuations in a supersymmetric model in FRW spacetime

Details Vacuum fluctuations in a supersymmetric model in FRW spacetime Vacuum fluctuations in a supersymmetric model in FRW spacetime

2011-04-07

arxiv.org/abs/1104.1349v1

Phys.Rev.D83:105003,2011

Physics

High Energy Physics

High Energy Physics - Theory

19 pages, accepted for publication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.83.105003

We study a noninteracting supersymmetric model in an expanding FRW spacetime. A soft supersymmetry breaking induces a nonzero contribution to the vacuum energy density. A short distance cutoff of the order of Planck length provides a scale for the vacuum energy density comparable with the observed cosmological constant. Assuming the presence of a dark energy substance in addition to the vacuum fluctuations of the field an effective equation of state is derived in a selfconsistent approach. The effective equation of state is sensitive to the choice of the cut-off but no fine tuning is needed.

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